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jdemaris
12-06-2006 06:31:27
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Re: 4020 24V solution in reply to TwoCylinderDiesel, 12-05-2006 17:43:01
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We changed over many 24V tractors to 12V at the last two Deere dealerships I worked at. We used the Delcos and also the Nippo 12 volt starters. We didn't see any gain in cranking speed with the Nippos versus the Delco. But, at the time, we considered the Nippo better built and more reliable. Also, when new (not rebuilt) we were buying the Nippos cheaper. As years went buy though, we found the repair-parts prices for the Nippos to be rediculous. A good 12 volt starter will spin the engine over just as fast as the previous 24 volt starter. The 24 volt starter has two major design flaws. One - with the original system is that it relies on being totally isolated with no hint of a ground. But, over time, just the dust inside the starter from brush wear creates a ground and that causes the two 12 volt systems on the tractor to go nuts. Two - the 24 volt starter has very small diameter wire in the windings - much smaller than used in a 12 volt - and they burn up very easy. So, in regard to taking abuse and overheating - the 24 volt starter was the worse of the bunch. And, from what I saw, most starters in diesels get terribly abused. Somebody who wants their tractor running on a cold morning - perhaps with a skid of logs to get out - or a load of fresh manure on the spreader starting to freeze - will do just about anything. I've seen starters get virtually melted, engines ruined with over-ether use, etc. In that sort of situation, the 24 volt starters were terrible, and the Nippo 12V the best. In all fairness though, the large-frame Delco 12V starters were pretty good when new. One persistent problem though, was rebuilt Delcos with cut armatures. They would not take heat and abuse. So, we changed our rebuilding policy, and all the big Delcos got brand new armatures when being rebuilt. I suppose now-adays there are gear-reduction Chinese starters for 4020s that will outperform anything else. I've got them on my Ford and GM diesel trucks, and also my Case diesel tractors. For $90 - $110 apiece new, they are amazing.
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